Radio gateway system and method for interfacing a radio system and an IP network

ABSTRACT

A radio gateway system and method for interfacing one or more radio systems and a packet network. The system comprises a plurality of gateways, each gateway including a radio interface port, a protocol converter and packet interface. The gateways convert audio and signaling from the radio system into packet signals in a generic protocol. The gateways also convert packet signals in the generic protocol into audio and signaling in a protocol understandable by a respective radio system.

FIELD OF THE INVENTION

This application relates to a radio gateway, system and method forenabling a radio system to communicate over a packet network.

BACKGROUND OF THE INVENTION

A problem particular to mobile radio dispatch systems is the distancebetween an operator dispatch console and RF transmission and receptionequipment. This problem arises because of the necessity to position theRF equipment to ensure geographic coverage.

This problem has traditionally been addressed by remoting the connectionbetween the dispatch console and the RF equipment over leased lines,using various multiplexing methods to combine the voice signals and thecontrol signals over a minimum number of lines. For instance, one commonmethod involves multiplexing a DC current over the AC voice signal, withthe magnitude and polarity of the current representing a specificfunction that the RF equipment must perform. Another common methodinvolves sending a precise tone sequence composed of audible tones, withthe frequency of the tones again representing a specific controlfunction. The method used depends on the type of the equipment.

In all cases, the control functions relayed using those methods pertainto basic RF equipment control. Functions pertaining to the exchange ofdata between the dispatch console and remote subscribers over the RFnetwork, such as the transport of unit ID or paging addresses, areachieved by overlaying a second multiplexing protocol, such as a lowbit-rate modem protocol or a second tone sequence protocol, over thevoice channel established between the dispatch console and thesubscriber units. This causes the following problems: first, the voicechannel is already non-ideal due to the underlying signal multiplexingmethod (this is especially true with the tone sequence method, thatreserves a portion of the audible spectrum), and second, the dispatchconsole needs to implement every variant of the subscriber unit dataprotocols.

Recently, there has been interest in the use of Voice over InternetProtocol methods to replace the leased lines used to remote the dispatchconsole to RF equipment link. Some commercial equipment exists today.However, this equipment aims only to replace the voice channel andmultiplexed current or tone signalling with packetized voice signals andembedded control sequences, while maintaining the data signalling as alow bit-rate coding method or second tone sequence method over thepacket voice channel. A dispatch console is then required to separatethe control signalling from the voice signalling. This method offers thefollowing drawbacks. First, it restricts the use of voice codecs to thetypes of codecs that will accurately reproduce the low bit-rate data ortone sequence. This poses a significant problem as the modern codecs aredesigned to model to speech tract and as such are not optimized to passmodulated data. This requires a codec using 32 kbps or more bandwidth,such as a G.726 ADPCM codec and enough bandwidth throughout the wholesystem to carry the combined signals. Secondly, the dispatch consolemust still implement all variants of the data protocols. This impliesthat a different interface card may be needed for each protocol.

SUMMARY OF THE INVENTION

The system and method described here, in addition to utilizing Voiceover Internet Protocol techniques for audio transport, utilizes aprotocol that is independent from the RF equipment control protocol orsubscriber unit data protocol, and can effectively encapsulate bothprotocols in a generic protocol that defines all possible radiofunctions. As such, embodiments of the present invention allow adispatch console to generically implement one protocol, and rely on theRadio Gateway to convert this protocol to the signals required tocontrol the RF equipment and the signals destined to the subscriberunits. Furthermore, by sending only unaltered voice in the packet voicechannel, the gateway can utilize any codec, independent of the codec'scapability to transport tone or data signals.

In one aspect of the present invention, there is provided acommunication system for enabling a plurality of radio systems tocommunicate over a packet network, each radio system communicating oneof at least two different radio protocols, the communication systemcomprising: a plurality of gateways adapted to communicate using ageneric protocol; for each radio protocol of the at least two radioprotocols: at least one gateway of the plurality of gateways convertingaudio and signalling in the radio protocol to and from audio andsignalling in the generic protocol for at least one radio system thatcommunicates using the radio protocol.

In a second aspect of the invention, there is provided a gatewaycomprising: a radio interface port connectable to communicate with aradio system; a packet interface operable to send and receive packetsignals; and a protocol converter adapted to convert audio andsignalling received from the radio system via the radio interface portinto packet signals in a generic protocol and to convert packet signalsin the generic protocol received via the packet interface into audio andsignalling in a protocol understandable by the radio system.

In a third aspect of the invention, there is provided a method ofenabling a radio system to communicate via a packet network, said methodcomprising: receiving audio and signalling from the radio system at aradio gateway; converting the audio and signalling into packet signalsin a generic protocol; providing the packet signals in the genericprotocol to the packet network for distribution to a desireddestination; receiving packet signals from the packet network, saidpacket signals being in the generic protocol; converting the packetsignals from the packet network into audio and signalling in a protocolunderstandable by the radio system; and transmitting the converted audioand signalling to the radio system.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in greater detail with reference tothe accompanying diagrams, in which:

FIG. 1 is a schematic drawing of a system within which an embodiment ofthe present invention may be employed;

FIG. 2 is a block diagram of one embodiment of the radio gateway of thepresent invention;

FIG. 3 is a flowchart of a method provided by an embodiment of thepresent invention;

FIG. 4 is a schematic drawing of a system provided by an embodiment ofthe present invention;

FIG. 5 is a schematic drawing of another embodiment of a radio gateway;and

FIG. 6 is a schematic drawing of a system provided by an embodiment ofthe present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Various embodiments of the present invention provide a gateway, a systemand a method for interfacing a radio system, such as a land based mobileradio system, to a packet network.

FIG. 1 is a schematic drawing of a system comprising a plurality ofgateways 230 each linked to a respective radio system 220 by arespective interface 250. Link 270 connects the gateway to a packetnetwork 60, such as an IP (Internet Protocol) network for example. Theradio systems 220 generate audio and signalling using a respectivenative protocol. In some embodiments, multiple different nativeprotocols are collectively implemented to radio systems 220. Examplesinclude baseband analog audio, DC control signalling, tone controlsignalling, local control signalling and subscriber unit signalling.Examples of subscriber unit signalling include a data burst with unitidentification information or driver status and featureenablement/disablement signals, such as a signal to disable the ignitionof a stolen vehicle.

In operation, each gateway 230 takes audio and signalling from interface250 and converts them to a generic protocol compatible for use over line270 and sends the converted signals over link 270 for distribution overthe packet network 60. The gateway 230 also does the reverse conversionof generic protocol signals received over link 270 to audio andsignalling and sends the audio and signalling to the radio station 220.The generic protocol used over link 270 is the same for all of thegateways.

In some embodiments, a radio station within the radio system converts RFsignals from a radio site to audio and signalling and sends the audioand signalling over interface 250 to the gateway 230. The radio stationalso does the reverse conversion from audio and signalling to RF signalsand sends the RF signals to the radio site. In some embodiments, theradio station has a digital interface, such as a USB port, and thegateway converts the signalling to whatever format the radio stationunderstands and sends the converted signalling over a data line to thedigital interface.

In some embodiments, each interface 250 has two separate lines, one forthe audio and one for the signalling. In some embodiments the audio is abaseband analog audio signal. In some embodiments the signalling is acontrol signal.

In some embodiments link 270 is two separate lines, one for theconverted audio and one for abstracted signals. In some embodiments theconverted audio is IP packet audio. In some embodiments, the IP packetaudio is sent over link 270 using Voice over IP protocol.

In different embodiments the packet network 60 is a Local Area Networkor Wide Area Network. An example of a WAN is the Internet. In someembodiments link 270 is an Ethernet LAN link. In other embodiments it isa WAN link.

In some embodiments, one or more of the gateways 230 are connected tothe packet network 60 through respective distributed call managementmodules. Distributed call management modules are distributed aggregationand control points for radio, telephone, operator entities and any audiodevice within a communication network. A specific example of adistributed call management module is described in Applicant's copendingU.S. patent application entitled “INTERNET PROTOCOL DISPATCH SYSTEM ANDMETHOD” and having attorney docket number 51764-2, and incorporatedherein by reference in its entirety. In some of such embodiments theinterface between the gateway and the distributed call management modulecan be a hardwired point-to-point connection. In other embodiments theinterface is a LAN.

Using the gateways 230, RF systems can communicate on a packet networkindependent of base station and subscriber signalling protocol. Thegateway extracts the signalling from the radio station and converts itto a common form. Examples of subscriber unit signalling that would gothrough the radio station to the gateway for conversion are: unit tounit data bursts with information such as unit identification; voicesignals; a signal to disable the ignition of a stolen car; and driverstatus signal in a taxi cab.

FIG. 2 is a block diagram of a gateway provided by an embodiment of thepresent invention. The gateway comprises a radio interface port 295 forreceiving signals from a radio system. The radio interface port 295 isconnected to a protocol converter 237, which is in turn connected to apacket interface 238. The packet interface 238 is connectable forcommunication with a packet network. In some embodiments the packetinterface 238 is modular. I.e. different packet interface modules may bechosen as appropriate for whatever application in which the gateway isto be used.

In operation, the protocol converter 237 converts the audio andsignalling received from the radio system into a generic protocol fortransmission over the packet network and converts generic radio controlsignals received from the packet network to audio and signalling in aformat understandable by the radio system. In some embodiments, theprotocol converter performs audio processing which can include vocoding,generating tone signalling, encoding and decoding data packets,adjusting audio level, and filtering audio. The protocol converter canbe any appropriate software, hardware or combinations thereof. Specificexamples are provided below with reference to FIG. 5.

FIG. 3 is a flowchart of a method according to the present invention. Acall is sent from station X to an end destination through gateway X(Step 302). The status of gateway X is determined (Step 304). In someembodiments, the status of the gateway is negotiated with a controllerbased on periodic status messages sent from the gateway to thecontroller and from the controller to the gateway. In some embodimentsmultiple gateways are connected in parallel to the radio station X. Onlyone gateway is active at a time and the active gateway will process thecall. Therefore, if gateway X is active, the gateway x receives audioand signalling from the radio station (Step 306). Gateway X thenconverts the audio and the signalling received from the radio systeminto a generic packet protocol independent of radio type (Step 308). Insome embodiments, the packets are made up of audio packets andsignalling packets. The packets are then sent to the end destinationthrough a packet network (Step 310). In some embodiments, a controllerassigns an IP address or channel for the gateway to use. The IP addresscan be static or dynamic.

Referring to FIG. 4, this figure depicts a schematic drawing of anexemplary system 10, comprised of a radio gateway 20 connected to aplurality of radio stations 30 via radio interfaces 50. The radiostations 30 are located in a radio site 40. In some embodiments, theradio stations are base stations or repeater stations. Gateway 20 isalso connected to an IP network 60 over an IP link 70. Also connected tothe IP network 60 are a terminal 80, such as an operator console, and acontrol system 90.

In some embodiments of the invention, the system 10 is a land mobileradio system, such a police dispatch system, an emergency dispatchsystem like 911 or a taxi cab dispatch system.

In operation, the gateway 20 translates the audio and signalling usedover radio interface 50, which is specific to radio stations 30, into aformat that is compatible for use over the IP link 70. This translationfacilitates the signalling with control system 90 and thus, allows thecontrol system 90 to control the radio station 30. It also enables theaudio to be interfaced with terminal 80, thus allowing a radioconversation to occur.

As stated before, the radio interface 50 is specific to radio stations30. In some embodiments, the radio interface 50 includes an audiointerface and a signalling interface.

In a given system, there will be multiple different gateway types, eachgateway type converting between a gateway-type-specific audio andcontrol interface combination, and the generic protocol. Severalspecific audio and control interface examples follow. The particulargateways included in a given system are system/application specific,depending on the nature of the radio sites included. Different gatewaysconfigured for different protocols may support many audio interfacevariants, including:

A “two-wire” interface, where the audio originating from a radio station30 and the audio originating from the terminal 80 are duplexed over thesame audio path. A duplex method can include “half-duplex”communications, where conversation alternates from one direction to theother, or “duplex” communications, where conversation can simultaneouslyflow in both directions; and

A “four-wire” interface, where the audio originating from a radiostation 30 and the audio originating from the terminal 80 use separateaudio paths.

For the purpose of discussing the illustrative embodiment, and withoutlimiting the invention to such exemplary embodiment, the radio gateway20 can support many signalling interface variants, including:

A “local” interface, where discrete digital control lines are used tocontrol the specific radio station 30 functions. In some embodiments,these digital control lines include a line to activate a transmitter inradio station 30, a line to disable a coded squelch feature in a radiostation 30, and a line to obtain the carrier status of a radio station30;

A “DC” interface, where a DC signal is superimposed on the audiointerface component of the radio interface 50. In some embodiments, thisDC signal is in the form of a regulated current, where a specificcurrent value specifies a function, such as activating the transmitterin a radio station 30, disabling coded squelch in a radio station 30, ortuning a radio station 30 to a different RF channel;

A variant of the “DC” interface also exists where the DC signal is notsuperimposed on the audio interface, but utilizes a distinct interface;this is typically used with a “four-wire” audio interface and is thentermed a “six-wire DC” interface;

A “tone” interface, where a series of tones are superimposed on theaudio interface component of the radio interface 50. In someembodiments, this series of tones may be in the form of a guard tone,which is of preset frequency, amplitude and duration; and function tone,which is of preset amplitude and duration but where a specific frequencyvalue specifies a function, such as activating a transmitter in a radiostation 30, disabling coded squelch in a radio station 30, or tuning aradio station 30 to a different RF channel;

A variant of the “tone” interface also exists where the tone signal isnot superimposed on the audio interface, but utilizes a distinctinterface; this is typically used with a “four wire” audio interface andis then termed a “six-wire tone” interface; and

A “digital” interface, where a character-based interface, such as anasynchronous serial link, supports a message-based interface forcontrolling functions, such as activating a transmitter in a radiostation 30, disabling coded squelch in a radio station 30, or tuning aradio station 30 to a different RF channel.

A generic protocol is used on IP link 70. The generic protocol caninclude events to be implemented over the IP link. Examples of eventsthat can be included in the generic protocol are:

Activating a transmitter in a radio station 30;

Releasing a transmitter in a radio station 30;

Enabling coded squelch in a radio station 30;

Disabling coded squelch in a radio station 30;

Tuning a transmitter in a radio station 30 to a specific RF channel;

Switching a receiver in a radio station 30 to a specific RF channel;

Selecting a specific coded squelch frequency in a radio station 30;

Monitoring the carrier status of a radio station 30;

Sending a data packet (e.g. unit ID) to a specific subscriber unit via aradio station 30;

Receiving a data packet (e.g. unit ID) from a specific subscriber unitvia a radio station 30; and

Sending a paging alert tone to a specific subscriber unit via a radiostation 30.

Of course, these are mere examples. Other events are possible.

In some embodiments, the IP link 70 utilizes a control protocol and anaudio protocol. The control protocol, such as the MGCP 1.0 (RFC 3435) orMEGACO 1.0 (RFC 3015) protocols, and future versions and variantsthereof, can define specific packages. A package is a set of events andsignals related to a specific interface. In some embodiments, thesepackages logically divide the signalling interface component of a radiointerface 50 into a series of events.

An example of a signal that can be sent from a controller to a gatewayis a Push-to-talk signal. The gateway converts the generic push-to-talksignal into the appropriate signal for the respective radio station,such as tone, local, DC or digital.

The audio protocol can define a payload format such as RTP (RFC 3550).The payload format will vary with the specific voice encoding used.Examples of voice encoding used in various embodiments include: ITUG.711; ITU G.723.1; ITU G.729; ETSI (European Telecommunication StandardInstitute) GSM (Global System for Mobile Communications); DVSI (DigitalVoice Systems, Inc) IMBE (Improved MultiBand Excitation); and ETSI TETRA(Terrestrial Trunked Radio). Of course, these are mere examples andother encodings are possible.

FIG. 5 schematically depicts an embodiment of radio gateway 20,comprised of a plurality of radio interface ports 95, an IP interface100, a provisioning interface 110, a communication processor 120 and adigital signal processor 130. The radio interface ports 95 communicateover and in accordance with the radio interface 50 for connection to theradio stations 30. Each radio interface port 95 is also in communicationwith the digital signal processor 130 via interface 136 and thecommunication processor 120 via interface 125. The digital signalprocessor 130 is also in communication with the communication processor120 via interface 135. The communication processor is in communicationwith the IP interface 100 via interface 105 and the provisioninginterface 110 via interface 115.

In FIG. 5, the digital signal processor 130 and the communicationprocessor 120 are shown as separate components. In those cases,interface 135 is an interprocessor bus, such as Host Port Interface orPCI. In some embodiments, the digital signal processor and thecommunication processor are collocated on a single processor.Preferably, the digital signal processor and the communication processorfunctions are embedded into a single SoC (System on Chip) processor.

The interface 125 between the radio interface port 95 and thecommunication processor 120 varies according to the radio system. Insome embodiments, the interface 125 is via discrete input/outputsignals. Preferably, the interface 105 between the communicationprocessor 120 and the IP interface 100 is a MII (Media IndependentInterface). The interface 115 between the communication processor 120and the provisioning interface 110 is preferably an asynchronous serialinterface.

The IP interface 100 communicates over and in accordance with the IPlink 70 for connection to the IP network 60. The provisioning interface110 communicates over and in accordance with the provisioning link 140for operatively connecting to the provisioning terminal 135. Theprovisioning terminal 135 can be used for initial provisioning of theradio gateway 20. In some embodiments the provisioning link 140 is aterminal interface. In some embodiments, provisioning of the radiogateway 20 includes assigning an IP address to the gateway. Once initialprovisioning is complete, subsequent provisioning can be performed viathe IP link 70, assuming the provisioning terminal 135 is operativelyconnected to the IP network 60 via IP link 150.

The digital signal processor 130 performs audio processing functionsused within the gateway 20. In various embodiments, the audio processingincludes any of the following functions: vocoding to the desired voiceencoding; generating tone signalling, encoding and decoding data packetstowards the radio; audio level adjustment; and audio filtering. Theaudio functions are not limited to this list. Preferably, the digitalsignal processor 130 takes audio from the radio interface port 95 inanalog form and converts it into pulse code modulation signals using aCODEC.

The communication processor 120 communicates over and in accordance withthe protocols used over the IP link 70 through IP interface 100. In someembodiments the protocols used over IP link 70 are chosen from but arenot limited to TCP/IP protocol, the RTP, MGCP and MEGACO protocols. Thecommunications processor also controls the radio interface ports 95 andimplements a protocol for the provisioning interface 110.

Different embodiments of the radio gateway 20 are possible, in fixed ormodular configurations. For example, a set number of radio interfaceports 95 can be part of the radio gateway 20, or the radio interfaceports 95 can be a modular add-onto the radio gateway 20.

Of course, in addition to the system in FIG. 4, the radio gateway 20 canbe used in other systems. FIG. 6 schematically depicts an exemplarysystem 160 embodying the present invention. Referring to FIG. 6, theexemplary system 160 includes: a trunked radio system 220; a controlradio station 170 operatively connected to a trunking controller 200;voice radio stations 210 operatively connected to radio gateways 20 overradio interfaces 50; an IP network 60 operatively connecting the radiogateways 20 over IP links 70; terminals 80; and a control system 90. Thetrunked radio system 220 comprises the control radio station 170 and thevoice radio stations 210.

In the system 160, the control system 90, in addition to controlling aplurality of radio gateways 20, works in parallel with a trunkingcontroller 200 to create a system where assignment of radio stations 210is dynamic.

In some embodiments, the control system 90 comprises means forcontrolling or managing communication between radio systems in adistributed manner using a packet network. In a preferred embodiment,the control system 90 comprises a plurality of distributed callmanagement modules, such as described earlier with reference to FIG. 4.In such embodiments, the generic protocol is understood by thedistributed call management modules. A single design of the distributedcall management module can be used to service multiple radio types.

Also, as shown by the dotted lines 55 in FIG. 6, the radio interfaces 50can be duplicated across multiple radio gateways 20 to provideredundancy, where of course, only one of the plurality of radiointerfaces to a given radio gateway 20 is active at a given time. Suchactivation can be achieved as described below.

In accordance with an aspect of the present invention, an IP interfacereports the status of a radio gateway 20 over an IP network 60 to acontrol system 90. There are many ways this status can be provided invarious embodiments. For example, the IP interface can periodicallyreport the status or it can report the status in response to an inquiryfrom control system 90. Based on the reported status from the variousradio gateways 20, the control system 90 selects a radio gateway 20 touse to control a given radio station. Of course, as will be recognized,the given radio station must be able to communicate with the selectedradio gateway. In various embodiments, this communication is eitherdirect or indirect. Indirect communication can be via intermediateequipment or the IP network.

In some embodiments, the radio gateways assume an inactive status ontheir respective radio interface by default, until ordered to becomeactive by the control system. To assist the control system in electing aradio gateway to become active, the radio gateways send a periodicstatus message to the control system over IP links. The status messagecontains information on the health of the radio gateway. The controlsystem can use this status message to determine which radio gatewaysshould be inactive and which should be active. The order to becomeactive or inactive is via a message from control system to radiogateways. In some embodiments, the control system sends a periodicstatus message to the radio gateways, to ensure that only one radiogateway is active at any given time. Upon failure to receive the statusmessage for a set time interval, the radio gateway will automaticallybecome inactive. There are of course many other ways of activating anddeactivating radio gateways, and the present invention does not dependupon and is not limited to any particular way.

In the above, a radio interface can be operatively connected to multipleradio gateways. With such a connection structure, the radio stations canbe multi-frequency based stations. For example, a radio station caninclude individual receivers for each of the frequencies, and share atransmitter for all of the frequencies.

What has been described is merely illustrative of the application of theprinciples of the invention. Other arrangements and methods can beimplemented by those skilled in the art without departing from thespirit and scope of the present invention.

1. A communication system including at least one controller for enablinga plurality of radio systems to communicate over a packet network, eachradio system communicating one of at least two different radio signalstransmitted using different radio protocols, the communication systemcomprising: a plurality of gateways adapted to communicate over an IPlink using a generic IP data packet protocol having a component forstoring audio signals and a component for storing radio control signals;for each radio signal of the at least two radio signals: at least onegateway of the plurality of gateways converting audio and controlprotocol signals in the radio protocols to and from audio and controlcomponents of the generic IP data packet protocol for at least one radiosystem that communicates using the radio signal; and wherein thecomponent of the generic IP data packet protocol for storing radiocontrol signals is configured to store at least one event selected froma group consisting of: enabling coded squelch in a radio station;disabling coded squelch in a radio station; and selecting a specificcoded squelch frequency in a radio station.
 2. The communication systemof claim 1, wherein the component of the generic IP data packet protocolfor storing radio control signals is configured to store at least oneevents selected from a group consisting of: activating a transmitter ina radio station; releasing a transmitter in a radio station; tuning atransmitter in a radio station to a specific RF channel switching areceiver in a radio station to a specific RF channel; monitoring thecarrier status of a radio station; sending a data packet to a specificsubscriber unit via a radio station; and receiving a data packet from aspecific subscriber unit via a radio station.
 3. The communicationsystem of claim 1, further comprising a control system for determiningif a gateway in the plurality of gateways is active and directingcommunications to and from at least one radio system through the gatewayif the gateway is active.
 4. The communication system of claim 3,wherein the control system comprises a plurality of distributed callmanagement modules, each distributed call management module configuredto understand the generic protocol.
 5. The communication system of claim4, wherein at least one gateway communicates with the packet networkthrough at least one distributed call management module.
 6. Thecommunication system of claim 5, wherein the at least one gateway ishardwire connected to the at least one distributed call managementmodule.
 7. The communication system of claim 5, further comprising a LAN(Local Area Network) between the at least one gateway and thedistributed call management module.
 8. The communication system of claim1, further comprising the plurality of radio systems.
 9. Thecommunication system of claim 8, wherein each radio system comprises aplurality of radio stations, each radio station in communication with atleast one gateway.
 10. The communication system of claim 8, furthercomprising the packet network.
 11. The communications system of claim 1,wherein the component of the generic IP data packet protocol for storingradio control signals is configured to store at least the event ofsending a paging alert tone to a specific subscriber unit via a radiostation.
 12. A gateway comprising: a radio interface port connectable tocommunicate with a radio system; a packet interface operable to send andreceive packet signals; and a protocol converter adapted to convertaudio and control protocol signals in radio protocols received from theradio system via the radio interface port into IP based packet signalsin a generic IP data packet protocol having a component for storing theaudio signals and a component for storing the radio control signals andto convert IP based packet signals in the generic IP data packetprotocol received via the packet interface into the audio and controlprotocol signals communicated by the radio system; wherein the componentof the generic IP data packet protocol for storing radio control signalsis configured to store at least one event selected from a groupconsisting of: enabling coded squelch in a radio station; disablingcoded squelch in a radio station; selecting a specific coded squelchfrequency in a radio station; and sending a paging alert tone to aspecific subscriber unit via a radio station.
 13. The gateway of claim12, wherein the component of the generic IP data packet protocol forstoring radio control signals is configured to store at least-one eventselected from a group consisting of: activating a transmitter in a radiostation; releasing a transmitter in a radio station; turning atransmitter in a radio station to a specific RF channel; switching areceiver in a radio station to a specific RF channel; monitoring thecarrier status of a radio station; sending a data packet to a specificsubscriber unit via a radio station; and receiving a data packet from aspecific subscriber unit via a radio station.
 14. The gateway of claim12, further comprising a plurality of radio interface ports, each radiointerface port operatively connectable to communicate with at least oneradio station within the radio system.
 15. The gateway of claim 12,wherein the packet interface is connectable to communicate over a LAN(Local Area Network).
 16. The gateway of claim 12, wherein the packetinterface is connectable to communicate over an IP (Internet Protocol)network.
 17. The gateway of claim 12, wherein the packet interfaceprovides a status of the radio gateway to a control system.
 18. Thegateway of claim 12, wherein the packet interface sends and receivespacket signals in accordance with a MGCP (Media Gateway ControlProtocol).
 19. The gateway of claim 12, wherein the interface sends andreceives packet signals in accordance with a MEGACO (Media GatewayControl) protocol.
 20. The gateway of claim 12, wherein the packetinterface sends and receives packet signals in accordance with an RTP(Real Time Protocol) audio protocol.
 21. The gateway of claim 12,wherein the packet interface sends and receives packet signals inaccordance with an audio protocol including packets in accordance withany one of G. 711, G. 723, G. 729, GSM (Global System for MobileCommunications), IMBE (Improved MultiBand Excitation) and TETRA(Terrestrial Trunked Radio) formats.
 22. The gateway of claim 12,wherein the protocol converter comprises a digital signal processor anda communication processor.
 23. The gateway of claim 22 furthercomprising a provisioning interface operatively connectable tocommunicate with a provisioning terminal.
 24. A method of enabling aradio system to communicate via a packet network, said methodcomprising: receiving audio and control protocol signals transmittedfrom the radio system at a radio gateway; converting at least one of theplural audio and control signals into IP based packet signals in ageneric IP data packet protocol having a component for storing audiosignals and a component for storing radio control signals; providing thepacket signals in the genetic IP data packet protocol to the packetnetwork for distribution to a desired destination; receiving IP basedpacket signals from the packet network, wherein said IP based packetsignals are in the generic IP data packet protocol; converting the IPbased packet signals from the packet network into non-IP based audio andcontrol protocol signals in a protocol understandable by the radiosystem; and transmitting the converted non-IP based audio and signalingto the radio system, wherein the component of the generic IP data packetprotocol for storing radio control signals is configured to store atleast one event selected from a group consisting of: enabling codedsquelch in a radio stations; disabling coded squelch in a radio station;and selecting a specific coded squelch frequency in a radio station. 25.The method of claim 24, further comprising: determining a status of aradio gateway associated with a radio station; and selecting the radiogateway to receive and convert audio and signaling from the radio systemand to receive and convert packet signals from the packet network if theradio gateway is active.